The value of _diffrn_data_frame.details  should give a
              description of special aspects of each frame of data.
              This is an appropriate location in which to record
              information from vendor headers as presented in those
              headers, but it should never be used as a substitute
              for providing the fully parsed information within
              the appropriate imgCIF/CBF categories.
              Normally, when a conversion from a miniCBF has been done
              the data from _array_data.header_convention
              should be transferred to this data item and
              _array_data.header_convention
              should be removed.